Added the API links for Empty Points and Fast Scatter UG

[tineshsf4652]

This PR updates the MAUI Toolkit User Guide by adding API links for Empty Points and Fast Scatter. These additions improve accessibility to relevant documentation, making it easier for developers to reference and implement these features.

Changes Made

1. Added the API links for Fast Scatter and Empty Point UG documentation
2. Modify the code snippet alignment.
3. Updated the respective code snippets output images for both Empty Point and Fast Scatter UG
   934698 Update fast scatter series image in .net MAUI Cartesian chart toolkit #244 This PR file changes are also included

[SyncfusionBuild]

Build Status: INPROGRESS 🔃
Build Location: Update_API_Link_EmptyPoint_FastScatter_UG

[SyncfusionBuild]

CI Status: SUCCESS ✅
Source Compilation: SUCCESS ✅
Build Location: Update_API_Link_EmptyPoint_FastScatter_UG
Technical Error(s): 0
Spelling Error(s): 0
Image Alt Text Error(s): 0
Image Size Error(s): 0
Image Name Error(s): 0
FT Layout Syntax Error(s): 0
Front matter Error(s): 0
File Path Error(s): 0
CodeSnippet File Path Missing Error(s): 0
Toc Anchor Tags Validation Error(s): 0
MD Tag Validation Error(s): 0